ALPESTRINE is a 10 letter word that starts with A.

1. \Al*pes"trine\, a. [L. Alpestris.]
   Pertaining to the Alps, or other high mountains; as,
   Alpestrine diseases, etc.
   
   

2. \Al*pes"trine\, a. (Bot.)
   Growing on the elevated parts of mountains, but not above the
   timbe? line; subalpine.